Sao Thong Hin (, ) is one of the six subdistricts (tambon) of Bang Yai District, in Nonthaburi Province, Thailand. Neighbouring subdistricts are (from north clockwise) Bang Rak Phatthana, Bang Rak Yai, Bang Len, Bang Muang and Bang Mae Nang. In 2020 it had a total population of 40,566 people.
The subdistrict is subdivided into 8 administrative villages (muban).
The area of the subdistrict is shared by two local administrative organizations.